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This is how I started to get familiar with SAP HCM.

1. Read an introductory book, \\
Grundkurs SAP ERP ([Verlag|http://www.viewegteubner.de/index.php;do=show/site=v/book_id=11089/sid=41e81be62f17b31e328a9750dff7e626]
, [Amazon|http://www.amazon.de/Grundkurs-SAP-ERP-Gesch%C3%A4ftsprozessorientierte-durchgehendem/dp/3834803618/ref=sr_1_1?ie=UTF8&qid=1249064572&sr=8-1])\\
This book focused more on explaning the general ERP and all related industrial processes idee. Not very useful for somebody in a job already.

2. Read an Payroll book, \\
Personalabrechnung mit SAP ([Verlag|http://www.sap-press.de/katalog/buecher/titel/gp/titelID-1703?GalileoSession=26039519A4.-x618Bgo],
[Amazon|http://www.amazon.de/Personalabrechnung-mit-SAP-J%C3%B6rg-Edinger/dp/3836211548/ref=sr_1_1?ie=UTF8&qid=1249064705&sr=8-1])\\
Seems to be a quite good and detailed book, but hard to understand without possibility to check in a real system.

3. To test I downloaded the [Trial Version|SAP NetWeaver ABAP Trial Version]\\
This was quite interesting, but I doscovered that it contains only SAP Basis, no HCM related stuff.

4. Read an ABAP book, \\
__ABAP Objects__ ([Verlag|http://www.sap-press.de/585],
[Amazon|http://www.amazon.de/ABAP-Objects-ABAP-Programming-SAP-NetWeaver/dp/1592290795/ref=sr_1_2?ie=UTF8&qid=1249065670&sr=8-2])\\
Excellent book, but does not cover all aspects.\\
Together with the trial version I wrote my [first program|SAP ABAP Programs]\\
This is how to [import the Book Examples|SAP Transport]

5.
Einmaleins der Entgeltabrechnung 2009 (
[Verlag|http://www.datakontext.com/index.php?seite=produkt&navigation=345&system_id=351&com=detail],
[Amazon|http://www.amazon.de/Einmaleins-Entgeltabrechnung-2009-Alexander-Enderes/dp/3895775428/ref=sr_1_1?ie=UTF8&qid=1249065969&sr=8-1])
)\\
Also very good book to get functional details.

6. SAP-Schnittstellenprogrammierung (
[Verlag|http://www.sap-press.de/katalog/buecher/titel/gp/titelID-1968?GalileoSession=19670049A4..al.ssxw],
[Amazon|http://www.amazon.de/SAP-Schnittstellenprogrammierung-Michael-Englbrecht/dp/3836213222/ref=pd_bxgy_b_img_b])

7. Now I found a great blog __[ABAP Trial Version for Newbies|https://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/6098]__

8. This one is a must: \\
__Personalwirtschaft mit SAP ERP HCM__ (
[Verlag|http://www.sap-press.de/katalog/buecher/titel/gp/titelID-1365?GalileoSession=24248412A4NQu7.J9To],
[Amazon|http://www.amazon.de/Personalwirtschaft-mit-SAP-ERP-HCM/dp/3898428656/ref=sr_1_1?ie=UTF8&s=books&qid=1254254835&sr=8-1])

9. Sicherheit und Berechtigungen in SAP-Systemen (
[Verlag|http://www.sap-press.de/katalog/buecher/titel/gp/titelID-1040?GalileoSession=24248412A4NQu7.J9To],
[Amazon|http://www.amazon.de/Sicherheit-Berechtigungen-SAP-Systemen-Risikomanagement-gesetzlicher/dp/389842670X/ref=sr_1_1?ie=UTF8&s=books&qid=1254254932&sr=1-1])

10. Another new Blog
[Basic ABAP OO eLearnings|http://www.sdn.sap.com/irj/scn/weblogs;jsessionid=%28J2EE3417500%29ID0015080350DB11438201993250772733End?blog=/pub/wlg/15408]

[OO Programming with ABAP Objects: Interfaces|http://www.sdn.sap.com/irj/scn/weblogs;jsessionid=%28J2EE3417600%29ID2052646750DB11084375775370126325End?blog=/pub/wlg/15820]

11. Another book?
[SAP NetWeaver Process Integration|http://www.sap-press.de/katalog/buecher/titel/gp/titelID-2087?GalileoSession=71159630A4-7e6tRb.g#leseproben]